// 时间
function fn() {
  var time = new Date();
  var str = "";
  var div = document.getElementById("time");
  //    console.log(time);
  var year = time.getFullYear();
  var mon = time.getMonth() + 1;
  var day = time.getDate();
  var h = time.getHours();
  var m = time.getMinutes();
  var s = time.getSeconds();
  var week = time.getDay();
  switch (week) {
  case 0:
    week = "日";
    break;
  case 1:
    week = "一";
    break;
  case 2:
    week = "二";
    break;
  case 3:
    week = "三";
    break;
  case 4:
    week = "四";
    break;
  case 5:
    week = "五";
    break;
  case 6:
    week = "六";
    break;
  }
  str = year + "年" + totwo(mon) + "月" + totwo(day) + "日" + "&nbsp;" + totwo(h) + ":" + totwo(m) + ":" + totwo(s)
      + "&nbsp;" + "星期" + week;
  div.innerHTML = str;
}
fn();
setInterval(fn, 1000);
function totwo(n) {
  if (n <= 9) {
    return n = "0" + n;
  } else {
    return n = "" + n;
  }
}
